I can see a dicotomy (divergence) in tasks related to smart-phones and desktops.
Desktops will become flat convertible laptop-tablets. Therein you will be able to type or dictate a document. You will be able to watch movies, to save them, and to store all the pictures and junk your heart/cloud storage provides.
The smart phone will become the gps, the shopping guide, the government bitcoin interface, the remote control device for all your appliances and of course the telephone and videophone.
The desktop will have a personal database. Not so for the smart phone, but the smart phone may use your desktop as a server.